From: Andrew Jones <drjones@redhat.com>
To: Andrea Bolognani <abologna@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
bijan.mottahedeh@oracle.com, Marc Zyngier <maz@kernel.org>,
Richard Henderson <richard.henderson@linaro.org>,
QEMU Developers <qemu-devel@nongnu.org>,
qemu-arm <qemu-arm@nongnu.org>
Subject: Re: [PATCH v1 0/5] target/arm/kvm: Provide an option to adjust virtual time
Date: Tue, 10 Dec 2019 15:33:11 +0100 [thread overview]
Message-ID: <20191210143311.4sen6blhfhzop6zw@kamzik.brq.redhat.com> (raw)
In-Reply-To: <29add42daba074ab5bdbd462b2d377115fec7c3c.camel@redhat.com>
On Tue, Dec 10, 2019 at 03:21:02PM +0100, Andrea Bolognani wrote:
> On Tue, 2019-12-10 at 14:32 +0100, Andrew Jones wrote:
> > After having done this git mining, it looks more and more like we should
> > at least consider naming this feature 'kvm-no-adjvtime' and probably
> > also change arm's default.
>
> I agree with everything except the naming: why would
>
> kvm-no-adjvtime=off vtime is adjusted (default)
> kvm-no-adjvtime=on vtime is not adjusted
>
> be better than
>
> kvm-adjvtime=on vtime is adjusted (default)
> kvm-adjvtime=off vtime is not adjusted
>
> ? Both offer the exact same amount of flexibility, but the latter has
> the advantage of not introducing any unwieldy double negatives.
>
A default of 'off' == 0 means not setting anything at all. There's
already precedent for 'kvm-no*' prefixed cpu features,
kvm-no-smi-migration
kvm-nopiodelay
(Unless there's something called a 'nopio' then I guess that one is
missing a -, but whatever...)
Thanks,
drew
next prev parent reply other threads:[~2019-12-10 14:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-16 14:34 [PATCH v1 0/5] target/arm/kvm: Provide an option to adjust virtual time Andrew Jones
2019-10-16 14:34 ` [PATCH v1 1/5] target/arm/kvm64: kvm64 cpus have timer registers Andrew Jones
2019-10-16 14:34 ` [PATCH v1 2/5] timer: arm: Introduce functions to get the host cntfrq Andrew Jones
2019-12-10 15:47 ` Peter Maydell
2019-12-10 16:41 ` Andrew Jones
2019-10-16 14:34 ` [PATCH v1 3/5] target/arm/kvm: Implement cpu feature kvm-adjvtime Andrew Jones
2019-12-10 15:54 ` Peter Maydell
2019-12-10 16:10 ` Andrew Jones
2019-10-16 14:34 ` [PATCH v1 4/5] tests/arm-cpu-features: Check feature default values Andrew Jones
2019-10-16 14:34 ` [PATCH v1 5/5] target/arm/cpu: Add the kvm-adjvtime CPU property Andrew Jones
2019-10-17 21:17 ` [PATCH v1 0/5] target/arm/kvm: Provide an option to adjust virtual time Masayoshi Mizuma
2019-10-18 12:02 ` Andrew Jones
2019-10-28 18:39 ` Masayoshi Mizuma
2019-12-06 15:22 ` Peter Maydell
2019-12-06 15:53 ` Andrew Jones
2019-12-10 9:51 ` Andrea Bolognani
2019-12-10 10:29 ` Peter Maydell
2019-12-10 11:05 ` Andrew Jones
2019-12-10 11:48 ` Peter Maydell
2019-12-10 13:32 ` Andrew Jones
2019-12-10 14:21 ` Andrea Bolognani
2019-12-10 14:33 ` Andrew Jones [this message]
2019-12-10 15:47 ` Andrea Bolognani
2019-12-10 16:08 ` Andrew Jones
2019-12-10 17:16 ` Andrea Bolognani
2019-12-10 15:45 ` Peter Maydell
2019-12-11 8:02 ` Guoheyi
2019-12-11 9:00 ` Andrew Jones
2019-12-11 13:50 ` Guoheyi
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